Dr. Wallen C.Y. Chan and the office staff are dedicated to providing the highest level of care to all patients. Dr. Chan earned his Medical Doctorate at the Mount Sinai School of Medicine in New York. He then completed his Internal Medicine residency training at the Mount Sinai Hospital in New York. Dr. Chan then completed his Gastroenterology fellowship at the Medical College of Pennsylvania, in Philadelphia. He is board certified by the American Board of Internal Medicine in both Internal Medicine and Gastroenterology. He has been in private practice since 1994 and sees patients in both Staten Island and Brooklyn. He is currently affiliated with Richmond University Medical Center as well as Maimonides Medical Center. Dr. Chan is a Fellow member of the American College of Gastroenterology (FACG). He also holds memberships in the American Gastroenterological Association (AGA), the American Society for Gastrointestinal Endoscopy (ASGE), and the New York Society for Gastrointestinal Endoscopy (NYSGE).